Related על קידושין 97:15

"That I am nothing other than poor", and he was rich but became poor; "That I am nothing other than rich", and he was poor but became rich; "That I am nothing other than a spice merchant", and he was a tanner but became a spice merchant; "That I am nothing other than a tanner", and he was a spice merchant but became a tanner; "That I am nothing other than a townsman", and he was a city dweller but became a townsman; "That I am nothing other than a city dweller", and he was a townsman but became a city dweller; "That I have no children", and he had [children] but they subsequently died; "That I have children", and he did not have them but they were subsequently born to him—she is not betrothed. This is the pneumonic: Any stipulation that is fulfilled at the moment of betrothal—even if it became void afterwards—she is betrothed; and any [stipulation] that is not fulfilled at the moment of betrothal—even if it was fulfilled afterwards—she is not betrothed.

One who leads the responsive recitation of the Shema, or blesses over fruit or over matzah, behold, he should not answer "amen" after himself. If he answered ["amen" after his own prayer], behold, this is how ignoramuses act. We do not answer with either an "orphaned amen" (i.e., where one does not know to what blessing he is saying "amen"), or a "truncated [amen]" (i.e., where one does not pronounce the entire word). Ben Azzai says, one who answers with an "orphaned amen" -- his children will be orphaned; with a "truncated [amen]," his days will be truncated. But whoever prolongs [his amen], his days and years will be prolonged.